Iterator::key

(PHP 5, PHP 7, PHP 8)

Iterator::keyRetorna a chave do elemento atual

Descrição

public Iterator::key(): mixed

Retorna a chave do elemento atual.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Retorta scalar em caso de sucesso, ou null em caso de falha.

Erros

Emite E_NOTICE em caso de falha.

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User Contributed Notes 3 notes

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8
michaelgranados at gmail dot com
10 years ago
Since PHP 5.5.X foreach can accept non scalar items. So the return can be anything ;)
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0
Lszl Lajos Jnszky
11 years ago
And converts everything to integer except string, so in php the post process could be:

public function key() {
$yourKey = $this->createYourKey();
if (is_object($yourKey) || is_array($yourKey))
throw new Exception('Array and Object not allowed.');
elseif (is_string($yourKey))
return $yourKey;
else
return (int) $yourKey;
}
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-1
sofe2038 at gmail dot com
3 years ago
This function may return any type, not just scalar, for some Iterator types. In particular, it is very trivial to write a generator function that yields arbitrary keys:

<?php
function foo() {
yield
null => 1;
yield new
stdclass => 2;
}
?>
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